Production device and process for generating propylene by utilizing C3 and C4 in liquid gas deep processing

Abstract

The invention belongs to the technical field of liquid gas deep processing and provides a production device and process for generating propylene by utilizing C3 and C4 in liquid gas deep processing. The production device mainly comprises a cracking unit, an absorption-stabilization unit, a gas fractionation unit and a dehydrogenation unit. The process comprises the following steps of: in the process flow, feeding a liquefied mixture gas rich in propane and butane and a liquefied mixture gas rich in butene to a unit for producing propylene through butene cracking and a unit of producing propylene and butene through oxidative dehydrogenation of butane and propane; carrying out high-temperature reaction in the presence of a catalyst in a reactor to generate propylene and butene; feeding propylene to the absorption-stabilization unit and the gas fractionation unit to finally obtain fine propylene and by-product dry gas; and feeding butene serving as an intermediate product to the butene cracking unit to be cracked to generate propylene. The production device and the process provided by the invention has the advantages that the one-sidedness existing in the existing liquefied gas processing is solved; C3 and C4 are processed roundly and converted into the propylene to the greatest extent; the purpose of greatly reducing the investment cost of liquefied gas processing devices is realized; and the social benefit of greatly popularizing the liquefied gas processing devices is realized.

Description

technical field [0001] The invention belongs to the technical field of deep processing of liquefied gas, and mainly relates to a production device and process for deep processing of liquefied gas from C3 and C4 to propylene. Background technique [0002] The catalytic conversion of low-carbon alkanes to olefins has always been a research hotspot in the field of petrochemical industry, and it will become one of the focuses of research and development of petrochemical technology in the new century. Among them, the dehydrogenation of ethane to ethylene and the dehydrogenation of propane to propylene are the two main research directions. However, ethane catalytic dehydrogenation reaction conditions are harsh, energy consumption is high, and the reaction is strictly limited by thermodynamic equilibrium. With regard to the current catalyst level, the single-pass yield of C2 (ethylene and ethane) can only hover around 25%, which is far from industrialization. Far, research in thi...

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Problems solved by technology

Due to the low investment (300-400 million RMB), this technology has been popularized in several private enterprises in Shandong since 2008. The product yield is about 24% (butene content in raw material gas is 65%). There are two main problems: catalyst technology and foreign countries The difference is relatively large, and the selectivity of catalyst activity is also low, resulting in a low overall conversion rate; the process route is relatively scattered, especially in fixed-bed reactors, and the matching between temperature control, reaction technology and catalyst activity is uncoordinated, which is not conducive to continuous reaction and stable, so the technology is also being refined

Individual enterprises began to consider the fluidized bed scheme, but the large investment, low conversion rate, and overall profit problem affected the industrialization process of this scheme; from the perspective of the above-mentioned technologies, liquefied gas processing is one-sided and cannot fully deal with C3 and C4. Maximize the conversion of C3 and C4 into propylene

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